Spaghetti with Parsley Pesto and Sausage

A sprinkling of crumbled spicy sausage makes a salty-savory finishing touch to herb-drenched pasta. Some pestos tend to go drab, but this one stays a brilliant emerald green.

Pantry Checklist:

• Spaghetti
• Spicy pork Italian sausage, casings removed
• Garlic cloves
• Fresh Parmigiano-Reggiano cheese
• Fresh flat-leaf parsley leaves